0.22.0 SwiftDOM / Swift 5.9

Drop support for Swift 5.8.

Moves all DOM files to new SwiftDOM module. All types are exposed with package access control so nothing can actually be used publicly.

What's Changed

• Moving DOM files to SwiftDOM Module by @swhitty in #80
• fix: visionos in podspec by @EyreFree in #81
• SwiftDOM is now published to cocoapods